Without insights into the threats affecting species across their distributions and throughout annual cycles, effective conservation management cannot be applied. The Whenua Hou diving petrel Pelecanoides whenuahouensis (WHDP) is a Critically Endangered small seabird whose offshore habits are poorly understood. We tracked WHDPs year-round in 2015/16, 2017/18, 2018/19 using global location-sensin...